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"AirSupply"
I have a question. How would you describe an overly stabilised pellet in comparison to an overly stabilise bullet? 

At very long range (in terms of flight time not distance) a bullet which has it's center of gravity father to the rear than a pellet's will be traveling "nose up" as it falls towards the target on it ballistic curve. This tends to cause the bullet to rotate up and to the right or left depending upon it's direction of rotation. In the extreme case the bullet goes through the trans-sonic region and the drag upsets the bullet and it begins to tumble because the center of pressure is ahead of the center of gravity.

For a pellet (drag stabilized) the center of gravity is ahead of the center of pressure. The pellet will never tumble it will; however, try to continue "nose up" when it is over stabilized and that usually results in spiraling when it gets far enough down range for the two forces to start "wrestling" with each other as to whether or not the pellet is going to travel "nose on" or "nose up".

 

[AirSupply]

Oldspook thanks. That all makes sense to me. 
Its really weird that with the amount that is known about how pellets behave in a ballistic sense there is still so much development and change going on. I know there is a wave of development going on shooting bullets from airguns with good results but like diablo pellets.
The ultimate for me would be when conditions are good I could shoot Moa groups consistently with a diablo pellet at 100m. I think the way things are going I will live to see that! 
Thanks again for taking the time to answer and filling in a few blank spaces in my airgun knowledge. 
Michael